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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65071b81bf313772a33fe2cf1c77a33e1b151303d7789ab822184e80019de80d' 
  AND token = 'Lv4PliLJCUJ9STsRin2ccYfURHUugj0BnYZCnE4m0uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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