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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be10fc792859916a2306f92abbf2b86bdce094862db43f1068561e2b100eee9' 
  AND token = 'C2sQrxthR7tFVk1fL7WGVb7x903qGoHBXWqO6up/OBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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