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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f2829849cb8362193df07b47de75e285c226df4c09364431bbad9671d57576' 
  AND token = 'eV6+YUNvvy9/4S/6cNBzlILkwAFsx8788LbSMq7W3eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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