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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586ad3f8d4ee37e928455881cb712f8dc657f9c74d4f62268ecb004514d24fbe' 
  AND token = 'N5qTn2mv6hiyzJuCD3cNAI2vX/j73nvLRwFQAhoFnaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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