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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '362d799c3c78cf9b92cf240613cfef6ba3e22b38631875bec4622f4ad0b0b3c6' 
  AND token = 'c4W1tDoQpn7XQ4aGDqLZCbn57sj2MUfaBIPZ+rekwf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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