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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75974bcf792e98abeb86a47199514b98d919e8dc055ca9abb244743d914666c9' 
  AND token = 'zQH4KpUInRFFlw6eeufvkljS5Y0BO1Siuoq22KsPiYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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