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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f274860124a07309d6930ee56f8302a1a93eda77a7d8ba12ee0b282a647e319f' 
  AND token = 'tiaONWlYRx35wK+ZqNtovWsNN8V1/fgm+THtWv2LwM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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