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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b15a4dfa8f35ad27b5413994be01113be41c9d6e1fef5973b2039aaced56a04b' 
  AND token = 'A/VwUCf/eUuthEjSFbQkl4KvQs294OQW/Red2yHX2wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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