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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9ff5a3d3dea0d5bab9dcaed5ad20724f4e280ee8ae930722d3410c948db4e1e' 
  AND token = 'gtfglrCxYVT9lkQmfPePIMBHXvaQ4J+kYtn8D9xhvUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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