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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fae6a0ad41acdaa86938625a13784e6078c2d4936ab1c8fab2a62e88aeba317' 
  AND token = '699SnsCaUdUG3me/sBojm40ljbyII0jLR5QssBKXoWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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