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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26c8f10ce0bf5fd8385f9b72b018cc81ecac87c909afaf9354a2080c066bf74a' 
  AND token = 'px5Sul42b7gv08gxZNKpsiWKNhmqdw9gMP/nRAvYeQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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