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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b4ecfeac1d7f2c996f5e5489c35042205bf96e6fcd2083d9d3aaedbc2afb5b' 
  AND token = 'T9fNVsHMS5mRQ+QTrdWfVamS3Cc8xbxrUQrsn4mNJXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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