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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0099421aa062d2e297a7a32a4050bf9c397ef5f748d3f4686f6ebf5821e16259' 
  AND token = 'SNM5pfiIEUPqVxHbeiLFGvxh/1j+uy1i1xzbCjUkdrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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