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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c266789837125d5b5dee0210329a643129be12bbdc88a678520a02b07d342abf' 
  AND token = 'N61e2b5wdmJ7BjUMaEBeQrdzZrSDRrEna5Bo882bVeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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