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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea9067a48e022e5d94f933bd7880d0f6369d47cd829a2af048c9f9d88d8ac39' 
  AND token = 'RkFGffLFrctRdl0nsBs1vPhDvtw8iIsorPOBzy01bcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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