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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cdc36bcd77525e125c465e01b064c1832505f36b93db2f957338343108b678' 
  AND token = 'yo3Xmyc+5XzYP7MZWGukFSTypWkr9jjBK1Lwtg7a4Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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