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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8353faf2c38626fb47ac96c5cdfc06acb94e5dc3a8a59976f252b8f6b6fb398' 
  AND token = '1If3eFWhjuADf0cCJnkRPt+zyQOVhQWjAA77t+ErPJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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