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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374be6e2917122ab5952fa66ae239338584e49544a4bdc78e9c23292c0572b73' 
  AND token = 'V4rad9uOE//SHp0qmBivoZcV3tS0RPNOcuLynPOOHXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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