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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77b5b594f1c73e65bbb9affd45b58bea127b4565e8cdcc07dfebcc1851d9e18' 
  AND token = 'oTeXuRZB1Df5Aa8H7gQ5aJ9Ami5kOPo6Ghy/pXea3Ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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