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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0b2a91ca9f77ae04d692b9841f100a7f9898915f8c32b924c3e1f06bc841374' 
  AND token = 'CS2KsOL19eyYAgr9aylykLms5OqX4CM2O60p/1JNWZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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