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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8015ff203d506d54e1d797fb502616c86708d3bfa8a2bd5686bcab06c014984a' 
  AND token = 'hZj5aQwwt7vzP6aDN2mdYGX0Zwd2IzoNajcteeaMfSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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