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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2cf0e4d3313458393ace29c453007f048ba6fc3bd417558627affd5a9c8c021' 
  AND token = '2zr4qXDjCZtIPWjzH72XAFaiadsJpc1DDorHO+h8V3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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