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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9397e0f6ebb7dc9e92e581857cbd4ccd2fc8da73a32dd25d1879bf33c723e712' 
  AND token = '3vdDmHkOPZzCKZerTWr8cFzNQSgW4TzRArn0su56fTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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