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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c59725f007ffabc1739f771e79f6d7892886187d3a1767d81d805b444ca716' 
  AND token = 'pJfVE4cwrtgqBaUx+LzcTMsC1PeYUMew5pu3adQ3zjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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