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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ec62a365309d082e6e5cc1d2dd6783b527d6b2b3521334873c99aeb8690583' 
  AND token = 'ELbh6Zm95TnDTKidosCdjFy5ef2Wc69x8tA7e5D5MUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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