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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3b4160a8df6dbdfc073e82d0f5206d4924a24e240c9ce402014e57ae34e5a44' 
  AND token = 'fenkRtwgC4BJYLn4VXM5s+uyBZ4yRULMoQi1jtyWKyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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