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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc0456865875c047067cd101ccb50efec3e6abe6a0500d708c018beaf80b715' 
  AND token = 'ZBEoSZ3ydhj6pRIf7To0os8lBxRKekpG5muCqKBFTF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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