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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2e8d4c29e216ffe0c8187f32e94261063a02ea3bd42a2787504f5dd1af2ac0' 
  AND token = 'FNrWJ0C7GAhT64zMno88yBPYoTro2txPF4VLiD+Pato=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}