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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9cfbce04ad8e327e2b83abcf97f0e458f336b00a7dbada80905db65a309c34' 
  AND token = 'gqPYpPg8kWasZAwghgR6ncKZjLh1o20yA82hU2X8n1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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