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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '474e1acd8fcdd6c8255425ad3e1a52f57a6bd036f3585049fd8cf7e89ef638fa' 
  AND token = '252yrKR8sOtB5eseEZrP+og8AwtXizG1NC/AWFDqUQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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