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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542ab2ddf1d403299ded8fd049da45be8ee33005876add208dede3b8972a6771' 
  AND token = 'bTruQHap+IRgkx08Kc9wYSU4vCfzMF13jyfwEA5Coj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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