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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f02909e2ee17ed98be368e8d376b85d6ecc93b8ee27fc7254e10b85b6a41968a' 
  AND token = 'TXv2/CJOT356xP1E9RuoubG0xnU4ixH26D5wRpg1nwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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