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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915c485d08d4b095b0b2b52cc783485f332205e5342c33dd9f48a2ba366b558e' 
  AND token = 'g2QezAicrb3/XY2zw7wlTArJAiLHTYSFkqpa5CrEgjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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