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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ed00a581bc3ee60125109631d892e134426587de17b03fb332b677275f6b658' 
  AND token = '1o4vwt1h5BOaAoCtrjiwPXzUflrfxg/7Ap2tHhqroN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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