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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6a3e4ca9ca8576b1dc99d10adb53ac84e5dde7c370f2a2b1371efbafc18095' 
  AND token = 'q8iR+NYvA9TPa1Mg/tYoDqa0pux93z+REMQU9XJYiRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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