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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ed0e803d0495c5a5d47da8e2e3298d8b5c8ee64429d00898a08d21c6dfd393' 
  AND token = 'i8Oclno0LMOfONzHxID6m/nse0ff/BOPQd31D4HStdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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