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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c70f0960ef34472581ac8d373bd065a83c3b51901a1c08310c5d0804abe7f40' 
  AND token = '58k5L88dfiA68y+QzeszR7frfIbVwRFD7UMmL9NvHnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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