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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6b06a5dbc5a0cb6fb318bc26597d3b7f3abd97cd992a4f926318b5bbfdebfc' 
  AND token = 'Lm4gPaaCgxcpQjCR/cu1DW/iyUa1nY9Jjulrb8PhT/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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