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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79c988239ea3b9589f32e17dfa3ed8175d4595636a5b4e05535bd2eff642af4' 
  AND token = '0SOaeCOcdHTu0xHA0URv6rBCm5YZCGDWAOhI+UotJuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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