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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f9df572e0f5ad7083b947aabd51a39359b0bbe44c04a07b9a923dca5c3bf27' 
  AND token = '/m9OrgOsn1OePOzZvJyOF3aBninFfzMU1J1qsZ6N1M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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