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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fa9297968c4f14c05bb2428871193f75cee87c0190fd355db5eeba9d6bf6e28' 
  AND token = 'eQBo48pxvUQFlfYVcNs6mltc9mKspli2k19bSlIpwQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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