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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f839399710936306923a5cfa28f9278478ac8bcf3543b43d8658b50adc8483d' 
  AND token = 'I1t9BqnhM7gpWf7KombpxeRZdTIZdYw8O2ghhta1tlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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