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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61326e9dee2ac3a5272e3776d520258582265248f5c90203720c5d6079190af6' 
  AND token = 'd6BC76t3lfuvTd+DDEldB+6sS/IgTeyr1zJWH+kXNko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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