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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af7355423723de46a0e3b01eb9f33c4561be67991f562e810b16717307bdb83' 
  AND token = '8VH4tivA9pkJP3LHHmXwufX9RJBXVLR2HC9M2rOifpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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