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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd811945fe46691587da81b358fab9d5aee926c4b3b5615803c377e2ae268ef66' 
  AND token = 'HAunFwvH4vaEP60K/8ySHySgpqo0MreOflf18paQszg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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