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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb585db05a3123e8d880a0c0506b6ed32821f1167cce6e3aebcf3100bd91975' 
  AND token = 'L7Abk2YCAkM2oX4wslsHSEDuwRXemdrX2+Etl5B7Sbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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