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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bade0b000b96a047cdd6ba850a1bb199e1e5461d65daca2b8205fea351c5d1b0' 
  AND token = 'epsCwis3B0onchtQLj/m1LprfUjat7DGpbnn0mcyks4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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