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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5341599335c071baabb3c6fb78f1160c250409f86ad88b50a85ec334b4b2f5' 
  AND token = 'tjkwBhe5+XEAfGhvfOf2p1gQT2/xC52f+BlRjyDQDkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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