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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a1a56e836537f128ae32293432e7626ea458663540476219f4006bf8c8d4e98' 
  AND token = 'WwW6T0SslQlmQHspc+A0OHpPB9KUiO03E221Vb5no8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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