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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5994d0c1c75af4bfd26b190d4ca01e041d11f6b15b4f287138bf2170bff6b6' 
  AND token = 'LU14iMJPk+Linv43kVAAu/BXCQ5pZUmeZGrc7i/l3Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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