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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c42980bbb5b691ab5726a3beca3a611d82f5aebea8b9237fff25496b6ae04ed' 
  AND token = '0T57LtttVYSr5fkqJNSpdX5WyS3F51/4O3tfUZCsDhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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