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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92b1cadc6bdc903689d8f7b2abe0a38448bc4aa2061fe3fc9775d8f21be520c' 
  AND token = 'oVOrHrGC3YWlxlnWXWCczH9PoTrDDYDwL7CmvlposYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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