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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e15b78902f4927f95159e3ddd0145d31db4a32c149dd8ae8b4942e20b742b1f' 
  AND token = 'dGhT+yemb+/RZpeDkEgRwxZY94YdJg0zhSefP+P53fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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