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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36448b167ce1b66320c13cb140eece23ba33d96bc249e2dac32d7947b832cff1' 
  AND token = 'q1EgST2WGkdh3rQ7zKXlw484kzCPlu4EpjqyIb+nj+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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