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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7437c486dbe883915c9b8352b84f64e44970de5fe7bdb4978201b13c48fc5f9' 
  AND token = 'KdG8RVy4OwZ9x5tA5xTdKgesctLYdDrkyUJAzd9mOQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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