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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d9ecac4e1cfde856718afc8afb1d891a08d9722d8753ed2db720060a9dbe86' 
  AND token = '8mS5Ez+M2lBm4ARblsjryf+DJW4bnPMu+z02bwCZlgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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