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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bbcfbde062b3e3fe8b646321162e7df2ebc197f898c2fab29d3f2b412f7623' 
  AND token = 'D3NbkzdeKtttQrKytX6tSUd6rCZLV6foTyzy5/DUCHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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