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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68a66615a558d170fc066384aaadba1945ccf0d0c17a0d84252a09e5869d4c7' 
  AND token = 'ct6isKAIbwpHzpCpKreVdPFU7itkascmbz4/0efsVmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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